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https://issues.apache.org/jira/browse/FLINK-27591?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17614858#comment-17614858
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Yunhong Zheng commented on FLINK-27591:
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Hi, [~godfreyhe] , I would like to get this ticket. Could you assign this to
me, Thanks a lot!
> Improve the plan for batch queries when statistics is unavailable
> ------------------------------------------------------------------
>
> Key: FLINK-27591
> URL: https://issues.apache.org/jira/browse/FLINK-27591
> Project: Flink
> Issue Type: New Feature
> Components: Table SQL / Planner
> Reporter: godfrey he
> Priority: Major
> Fix For: 1.17.0
>
>
> This jira is an umbrella issue, which aims to improve the plan for batch
> queries when statistics is unavailable.
> Currently, when statistics is unavailable, the planner will give default
> cost, which may lead to the planner choosing bad plan, such as: wrong
> broadcast join plan will cause a lot of network shuffle and OOM.
> We can detect whether the source tables have statistics. if not, join order,
> hash join can be disabled.
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